diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..aeab5ff
Binary files /dev/null and b/.DS_Store differ
diff --git a/Model/CoreDataManager.swift b/Model/CoreDataManager.swift
new file mode 100644
index 0000000..ecf39a7
--- /dev/null
+++ b/Model/CoreDataManager.swift
@@ -0,0 +1,74 @@
+//
+//  CoreDataManager.swift
+//  MyCreditManager_dosh.kor
+//
+//  Created by 신동오 on 2022/12/06.
+//
+
+import Foundation
+import CoreData 
+
+final class CoreDataManager {
+    
+    // singleton
+    static let shared: CoreDataManager = CoreDataManager()
+    
+    let modelName: String = "GradeCard"
+    
+    // Persistent Container load
+    lazy var persistentContainer: NSPersistentContainer = {
+        let container = NSPersistentContainer(name: "Model")
+        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
+            if let error = error as NSError? {
+                fatalError("Unresolved error \(error), \(error.userInfo)")
+            }
+        })
+        return container
+    }()
+    
+    // Managed Object Context
+    var context: NSManagedObjectContext {
+        return persistentContainer.viewContext
+    }
+    
+    func saveToContext() {
+        if context.hasChanges {
+            do {
+                try context.save()
+            } catch {
+                print(error.localizedDescription)
+            }
+        }
+    }
+    
+    func readGradeCards() -> [GradeCard] {
+        var gradeCardArray:[GradeCard] = []
+        let request = NSFetchRequest<NSManagedObject>(entityName: modelName)
+        
+        do {
+            if let fetchedGradeCard = try context.fetch(request) as? [GradeCard] {
+                gradeCardArray = fetchedGradeCard
+            }
+        } catch {
+            print("read() 실패", error.localizedDescription)
+        }
+        
+        return gradeCardArray
+    }
+    
+    func createGradeCard(name: String, subject: String?, grade: String?) {
+        if let entity = NSEntityDescription.entity(forEntityName: modelName, in: context){
+            if let gradeCard = NSManagedObject(entity: entity, insertInto: context) as? GradeCard {
+                gradeCard.name = name
+                gradeCard.subject = subject ?? "empty"
+                gradeCard.grade = grade ?? "empty"
+                self.saveToContext()
+            }
+        }
+    }
+    
+    func deleteGradeCard(data: GradeCard) {
+                    context.delete(data)
+                    self.saveToContext()
+    }
+}
diff --git a/Model/GradeCard+CoreDataClass.swift b/Model/GradeCard+CoreDataClass.swift
new file mode 100644
index 0000000..76e83ad
--- /dev/null
+++ b/Model/GradeCard+CoreDataClass.swift
@@ -0,0 +1,15 @@
+//
+//  GradeCard+CoreDataClass.swift
+//  MyCreditManager_dosh.kor
+//
+//  Created by 신동오 on 2022/12/06.
+//
+//
+
+import Foundation
+import CoreData
+
+@objc(GradeCard)
+public class GradeCard: NSManagedObject {
+
+}
diff --git a/Model/GradeCard+CoreDataProperties.swift b/Model/GradeCard+CoreDataProperties.swift
new file mode 100644
index 0000000..7e92a52
--- /dev/null
+++ b/Model/GradeCard+CoreDataProperties.swift
@@ -0,0 +1,27 @@
+//
+//  GradeCard+CoreDataProperties.swift
+//  MyCreditManager_dosh.kor
+//
+//  Created by 신동오 on 2022/12/06.
+//
+//
+
+import Foundation
+import CoreData
+
+
+extension GradeCard {
+
+    @nonobjc public class func fetchRequest() -> NSFetchRequest<GradeCard> {
+        return NSFetchRequest<GradeCard>(entityName: "GradeCard")
+    }
+
+    @NSManaged public var grade: String?
+    @NSManaged public var name: String?
+    @NSManaged public var subject: String?
+
+}
+
+extension GradeCard : Identifiable {
+
+}
diff --git a/Model/LocalItem.swift b/Model/LocalItem.swift
new file mode 100644
index 0000000..07027ca
--- /dev/null
+++ b/Model/LocalItem.swift
@@ -0,0 +1,10 @@
+//
+//  LocalItem.swift
+//  MyCreditManager_dosh.kor
+//
+//  Created by 신동오 on 2022/12/08.
+//
+
+import Foundation
+
+let permittedString: [String] = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", " "]
diff --git a/MyCreditManager_dosh.kor.xcodeproj/project.pbxproj b/MyCreditManager_dosh.kor.xcodeproj/project.pbxproj
new file mode 100644
index 0000000..64cef95
--- /dev/null
+++ b/MyCreditManager_dosh.kor.xcodeproj/project.pbxproj
@@ -0,0 +1,326 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 56;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		E7C6572F293F62960072B439 /* main.swift in Sources */ = {isa = PBXBuildFile; fileRef = E7C6572E293F62960072B439 /* main.swift */; };
+		E7C6574A293F674E0072B439 /* Model.xcdatamodeld in Sources */ = {isa = PBXBuildFile; fileRef = E7C65748293F674E0072B439 /* Model.xcdatamodeld */; };
+		E7C65751293F67E70072B439 /* CoreDataManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = E7C65750293F67E70072B439 /* CoreDataManager.swift */; };
+		E7C65754293F691C0072B439 /* GradeCard+CoreDataClass.swift in Sources */ = {isa = PBXBuildFile; fileRef = E7C65752293F691C0072B439 /* GradeCard+CoreDataClass.swift */; };
+		E7C65755293F691C0072B439 /* GradeCard+CoreDataProperties.swift in Sources */ = {isa = PBXBuildFile; fileRef = E7C65753293F691C0072B439 /* GradeCard+CoreDataProperties.swift */; };
+		E7F3CC71294171C400DDC821 /* LocalItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = E7F3CC70294171C300DDC821 /* LocalItem.swift */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXCopyFilesBuildPhase section */
+		E7C65729293F62960072B439 /* CopyFiles */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = /usr/share/man/man1/;
+			dstSubfolderSpec = 0;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 1;
+		};
+/* End PBXCopyFilesBuildPhase section */
+
+/* Begin PBXFileReference section */
+		E7C6572B293F62960072B439 /* MyCreditManager_dosh.kor */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = MyCreditManager_dosh.kor; sourceTree = BUILT_PRODUCTS_DIR; };
+		E7C6572E293F62960072B439 /* main.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = main.swift; sourceTree = "<group>"; };
+		E7C65749293F674E0072B439 /* Model.xcdatamodel */ = {isa = PBXFileReference; lastKnownFileType = wrapper.xcdatamodel; path = Model.xcdatamodel; sourceTree = "<group>"; };
+		E7C65750293F67E70072B439 /* CoreDataManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CoreDataManager.swift; sourceTree = "<group>"; };
+		E7C65752293F691C0072B439 /* GradeCard+CoreDataClass.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "GradeCard+CoreDataClass.swift"; sourceTree = "<group>"; };
+		E7C65753293F691C0072B439 /* GradeCard+CoreDataProperties.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "GradeCard+CoreDataProperties.swift"; sourceTree = "<group>"; };
+		E7F3CC70294171C300DDC821 /* LocalItem.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LocalItem.swift; sourceTree = "<group>"; };
+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		E7C65728293F62960072B439 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		E7C65722293F62960072B439 = {
+			isa = PBXGroup;
+			children = (
+				E7C6574F293F67A70072B439 /* Model */,
+				E7C6572D293F62960072B439 /* MyCreditManager_dosh.kor */,
+				E7C6572C293F62960072B439 /* Products */,
+			);
+			sourceTree = "<group>";
+		};
+		E7C6572C293F62960072B439 /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				E7C6572B293F62960072B439 /* MyCreditManager_dosh.kor */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		E7C6572D293F62960072B439 /* MyCreditManager_dosh.kor */ = {
+			isa = PBXGroup;
+			children = (
+				E7C6572E293F62960072B439 /* main.swift */,
+				E7C65748293F674E0072B439 /* Model.xcdatamodeld */,
+			);
+			path = MyCreditManager_dosh.kor;
+			sourceTree = "<group>";
+		};
+		E7C6574F293F67A70072B439 /* Model */ = {
+			isa = PBXGroup;
+			children = (
+				E7C65752293F691C0072B439 /* GradeCard+CoreDataClass.swift */,
+				E7C65753293F691C0072B439 /* GradeCard+CoreDataProperties.swift */,
+				E7C65750293F67E70072B439 /* CoreDataManager.swift */,
+				E7F3CC70294171C300DDC821 /* LocalItem.swift */,
+			);
+			path = Model;
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		E7C6572A293F62960072B439 /* MyCreditManager_dosh.kor */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = E7C65732293F62960072B439 /* Build configuration list for PBXNativeTarget "MyCreditManager_dosh.kor" */;
+			buildPhases = (
+				E7C65727293F62960072B439 /* Sources */,
+				E7C65728293F62960072B439 /* Frameworks */,
+				E7C65729293F62960072B439 /* CopyFiles */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = MyCreditManager_dosh.kor;
+			productName = MyCreditManager_dosh.kor;
+			productReference = E7C6572B293F62960072B439 /* MyCreditManager_dosh.kor */;
+			productType = "com.apple.product-type.tool";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		E7C65723293F62960072B439 /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				BuildIndependentTargetsInParallel = 1;
+				LastSwiftUpdateCheck = 1410;
+				LastUpgradeCheck = 1410;
+				TargetAttributes = {
+					E7C6572A293F62960072B439 = {
+						CreatedOnToolsVersion = 14.1;
+					};
+				};
+			};
+			buildConfigurationList = E7C65726293F62960072B439 /* Build configuration list for PBXProject "MyCreditManager_dosh.kor" */;
+			compatibilityVersion = "Xcode 14.0";
+			developmentRegion = en;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				en,
+				Base,
+			);
+			mainGroup = E7C65722293F62960072B439;
+			productRefGroup = E7C6572C293F62960072B439 /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				E7C6572A293F62960072B439 /* MyCreditManager_dosh.kor */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXSourcesBuildPhase section */
+		E7C65727293F62960072B439 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				E7F3CC71294171C400DDC821 /* LocalItem.swift in Sources */,
+				E7C6572F293F62960072B439 /* main.swift in Sources */,
+				E7C65754293F691C0072B439 /* GradeCard+CoreDataClass.swift in Sources */,
+				E7C65751293F67E70072B439 /* CoreDataManager.swift in Sources */,
+				E7C65755293F691C0072B439 /* GradeCard+CoreDataProperties.swift in Sources */,
+				E7C6574A293F674E0072B439 /* Model.xcdatamodeld in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin XCBuildConfiguration section */
+		E7C65730293F62960072B439 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				MACOSX_DEPLOYMENT_TARGET = 12.6;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = macosx;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+			};
+			name = Debug;
+		};
+		E7C65731293F62960072B439 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				MACOSX_DEPLOYMENT_TARGET = 12.6;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				SDKROOT = macosx;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+			};
+			name = Release;
+		};
+		E7C65733293F62960072B439 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		E7C65734293F62960072B439 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		E7C65726293F62960072B439 /* Build configuration list for PBXProject "MyCreditManager_dosh.kor" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				E7C65730293F62960072B439 /* Debug */,
+				E7C65731293F62960072B439 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		E7C65732293F62960072B439 /* Build configuration list for PBXNativeTarget "MyCreditManager_dosh.kor" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				E7C65733293F62960072B439 /* Debug */,
+				E7C65734293F62960072B439 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+
+/* Begin XCVersionGroup section */
+		E7C65748293F674E0072B439 /* Model.xcdatamodeld */ = {
+			isa = XCVersionGroup;
+			children = (
+				E7C65749293F674E0072B439 /* Model.xcdatamodel */,
+			);
+			currentVersion = E7C65749293F674E0072B439 /* Model.xcdatamodel */;
+			path = Model.xcdatamodeld;
+			sourceTree = "<group>";
+			versionGroupType = wrapper.xcdatamodel;
+		};
+/* End XCVersionGroup section */
+	};
+	rootObject = E7C65723293F62960072B439 /* Project object */;
+}
diff --git a/MyCreditManager_dosh.kor.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/MyCreditManager_dosh.kor.xcodeproj/project.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/MyCreditManager_dosh.kor.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/MyCreditManager_dosh.kor.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/MyCreditManager_dosh.kor.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/MyCreditManager_dosh.kor.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/MyCreditManager_dosh.kor.xcodeproj/project.xcworkspace/xcuserdata/dosh.kor.xcuserdatad/UserInterfaceState.xcuserstate b/MyCreditManager_dosh.kor.xcodeproj/project.xcworkspace/xcuserdata/dosh.kor.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
index 0000000..02d5715
Binary files /dev/null and b/MyCreditManager_dosh.kor.xcodeproj/project.xcworkspace/xcuserdata/dosh.kor.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/MyCreditManager_dosh.kor.xcodeproj/xcuserdata/dosh.kor.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist b/MyCreditManager_dosh.kor.xcodeproj/xcuserdata/dosh.kor.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
new file mode 100644
index 0000000..6593849
--- /dev/null
+++ b/MyCreditManager_dosh.kor.xcodeproj/xcuserdata/dosh.kor.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Bucket
+   uuid = "9395DA8D-D8AE-42BD-90D4-44D9E22A1E19"
+   type = "1"
+   version = "2.0">
+   <Breakpoints>
+      <BreakpointProxy
+         BreakpointExtensionID = "Xcode.Breakpoint.FileBreakpoint">
+         <BreakpointContent
+            uuid = "065B299C-00AF-47E4-B24C-253EB7974185"
+            shouldBeEnabled = "Yes"
+            ignoreCount = "0"
+            continueAfterRunningActions = "No"
+            filePath = "Model/GradeCard+CoreDataProperties.swift"
+            startingColumnNumber = "9223372036854775807"
+            endingColumnNumber = "9223372036854775807"
+            startingLineNumber = "19"
+            endingLineNumber = "19"
+            landmarkName = "GradeCard"
+            landmarkType = "21">
+         </BreakpointContent>
+      </BreakpointProxy>
+   </Breakpoints>
+</Bucket>
diff --git a/MyCreditManager_dosh.kor.xcodeproj/xcuserdata/dosh.kor.xcuserdatad/xcschemes/xcschememanagement.plist b/MyCreditManager_dosh.kor.xcodeproj/xcuserdata/dosh.kor.xcuserdatad/xcschemes/xcschememanagement.plist
new file mode 100644
index 0000000..17698cb
--- /dev/null
+++ b/MyCreditManager_dosh.kor.xcodeproj/xcuserdata/dosh.kor.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>MyCreditManager_dosh.kor.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>
diff --git a/MyCreditManager_dosh.kor/Model.xcdatamodeld/Model.xcdatamodel/contents b/MyCreditManager_dosh.kor/Model.xcdatamodeld/Model.xcdatamodel/contents
new file mode 100644
index 0000000..219e3b2
--- /dev/null
+++ b/MyCreditManager_dosh.kor/Model.xcdatamodeld/Model.xcdatamodel/contents
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="21512" systemVersion="21G115" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
+    <entity name="GradeCard" representedClassName="GradeCard" syncable="YES">
+        <attribute name="grade" optional="YES" attributeType="String"/>
+        <attribute name="name" optional="YES" attributeType="String"/>
+        <attribute name="subject" optional="YES" attributeType="String"/>
+    </entity>
+</model>
\ No newline at end of file
diff --git a/MyCreditManager_dosh.kor/main.swift b/MyCreditManager_dosh.kor/main.swift
new file mode 100644
index 0000000..a3297c0
--- /dev/null
+++ b/MyCreditManager_dosh.kor/main.swift
@@ -0,0 +1,381 @@
+//
+//  main.swift
+//  MyCreditManager_dosh.kor
+//
+//  Created by 신동오 on 2022/12/06.
+//
+
+import Foundation
+import CoreData
+
+let dataManager = CoreDataManager()
+
+while true {
+    
+    var finishFlag = 0
+    
+    print("원하는 기능을 입력해주세요 \n 1: 학생추가, 2: 학생삭제, 3: 성적추가(변경), 4: 성적삭제, 5: 평점보기, X: 종료")
+    let menuInput = readLine()
+    
+    if menuInput == "X" {
+        print("프로그램을 종료합니다...")
+        break
+    }
+    
+    switch menuInput {
+    case "1":
+        print("추가할 학생의 이름을 입력해주세요")
+        
+        let userInput = readLine()
+        
+        // ==================== input check(S) ====================
+        // 곧바로 엔터친 경우
+        if userInput == "" {
+            print("입력이 잘못되었습니다. 다시 확인해 주세요")
+            break
+        }
+        
+        // 스페이스가 포함된 경우
+        if let userInput = userInput {
+            if userInput.contains(" ") {
+                print("입력이 잘못되었습니다. 다시 확인해 주세요")
+                break
+            }
+        }
+        
+        // 알파벳, 숫자, + 기호 이외 문자를 입력한 경우
+        for i in userInput! {
+            if permittedString.contains(String(i)) == false {
+                print("알파벳 대문자, 소문자, 숫자, + 기호만 입력이 가능합니다.")
+                finishFlag = 1
+                break
+            }
+        }
+        
+        if finishFlag == 1 { break }
+        // ==================== input check(E) ====================
+        // 이미 등록된 이름인지 확인
+        let gradeCardArray: [GradeCard] = dataManager.readGradeCards()
+        for gradeCard in gradeCardArray {
+            if let name = gradeCard.name {
+                if name == userInput! {
+                    print("\(name)은 이미 존재하는 학생입니다. 추가하지 않습니다.")
+                    finishFlag = 1
+                    break
+                }
+            }
+        }
+        
+        if finishFlag == 1 { break }
+        
+        // 입력받은 이름을 저장한다.
+        dataManager.createGradeCard(name: userInput!, subject: nil, grade: nil)
+        print("\(userInput!) 학생을 추가했습니다.")
+        
+    case "2":
+        print("삭제할 학생의 이름을 입력해주세요")
+        
+        let userInput = readLine()
+        
+        // ==================== input check(S) ====================
+        // 곧바로 엔터친 경우
+        if userInput == "" {
+            print("입력이 잘못되었습니다. 다시 확인해 주세요")
+            break
+        }
+        
+        // 스페이스가 포함된 경우
+        if let userInput = userInput {
+            if userInput.contains(" ") {
+                print("입력이 잘못되었습니다. 다시 확인해 주세요")
+                break
+            }
+        }
+        // 알파벳, 숫자, + 기호 이외 문자를 입력한 경우
+        for i in userInput! {
+            if permittedString.contains(String(i)) == false {
+                print("알파벳 대문자, 소문자, 숫자, + 기호만 입력이 가능합니다.")
+                finishFlag = 1
+                break
+            }
+        }
+        
+        if finishFlag == 1 { break }
+        // ==================== input check(E) ====================
+        
+        // context 에서 데이터 가져오기
+        let fetchedGradeCards: [GradeCard] = dataManager.readGradeCards()
+        var willBeDeletedGradeCards: [GradeCard] = []
+        
+        for fetchedGradeCard in fetchedGradeCards {
+            if fetchedGradeCard.name == userInput {
+                willBeDeletedGradeCards.append(fetchedGradeCard)
+            }
+        }
+        
+        // 입력 받은 이름이 context 에 있는/없는 경우
+        if willBeDeletedGradeCards.isEmpty {
+            print("\(userInput!) 학생을 찾지 못했습니다.")
+            break
+        } else {
+            for willDeleteGradeCard in willBeDeletedGradeCards {
+                dataManager.deleteGradeCard(data: willDeleteGradeCard)
+            }
+            print("\(userInput!) 학생을 삭제하였습니다.")
+        }
+        
+    case "3":
+        print("성적을 추가할 학생의 이름, 과목 이름, 성적(A+, A0, F 등)을 띄어쓰기로 구분하여 차례로 작성해 주세요.\n 입력예) Mickey Swift A+ \n 만약에 학생의 성적 중 해당 과목이 존재하면 기존 점수가 갱신됩니다.")
+        
+        let userInput = readLine()
+        
+        // ==================== input check(S) ====================
+        // 곧바로 엔터친 경우
+        if userInput == "" {
+            print("입력이 잘못되었습니다. 다시 확인해 주세요")
+            break
+        }
+        
+        // 알파벳, 숫자, + 기호, " " 이외 문자를 입력한 경우
+        for i in userInput! {
+            if permittedString.contains(String(i)) == false {
+                print("알파벳 대문자, 소문자, 숫자, + 기호만 입력이 가능합니다.")
+                finishFlag = 1
+                break
+            }
+        }
+        
+        if finishFlag == 1 { break }
+        
+        // 스페이스를 두 번 입력하였는가?(3개의 단어로 쪼개지는지)
+        if userInput!.filter({ $0 == " "}).count != 2 {
+            print("입력이 잘못되었습니다. 다시 확인해 주세요")
+            break
+        }
+        // 스페이스 두 번이 연속으로 친건 아닌가?
+        let changeSpaceString = userInput!.replacingOccurrences(of: " ", with: "*")
+        if changeSpaceString.contains("**") {
+            print("입력이 잘못되었습니다. 다시 확인해 주세요")
+            break
+        }
+        // ==================== input check(E) ====================
+        
+        // 입력을 name, subject, grade 로 분리하기
+        let firstSpaceIndex = userInput!.firstIndex(of: " ")!
+        let lastSpaceIndex = userInput!.lastIndex(of: " ")!
+
+        let behindOfFirstSpaceIndex = userInput!.index(firstSpaceIndex, offsetBy: 1)
+        let behindOfSecondSpaceIndex = userInput!.index(lastSpaceIndex, offsetBy: 1)
+
+        let name = String(userInput![..<firstSpaceIndex])
+        let subject = String(userInput![behindOfFirstSpaceIndex..<lastSpaceIndex])
+        let grade = String(userInput![behindOfSecondSpaceIndex...])
+        
+        // context 에서 데이터 가져오기
+        let fetchedGradeCards: [GradeCard] = dataManager.readGradeCards()
+        var GradeCards: [GradeCard] = []
+        
+        for fetchedGradeCard in fetchedGradeCards {
+            if fetchedGradeCard.name == name {
+                GradeCards.append(fetchedGradeCard)
+            }
+        }
+        
+        // userInput 으로 받은 name이 context 에 있는/없는 경우
+        if GradeCards.isEmpty {
+            print("\(name) 학생을 찾지 못했습니다.")
+            break
+        } else {
+            // 과목명이 있으면 update
+            for GradeCard in GradeCards {
+                if GradeCard.subject == subject {
+                    GradeCard.grade = grade
+                    dataManager.saveToContext()
+                    finishFlag = 1
+                    print("\(name) 학생의 \(subject) 과목이 \(grade)로 변경되었습니다.")
+                    break
+                }
+            }
+            if finishFlag == 1 { break }
+        }
+        
+        // 과목명이 없다면 create()
+        dataManager.createGradeCard(name: name, subject: subject, grade: grade)
+        print("\(name) 학생의 \(subject) 과목이 \(grade)로 추가되었습니다.")
+        
+        
+    case "4":
+        print("성적을 삭제할 학생의 이름, 과목 이름을 띄어쓰기로 구분하여 차례로 작성해 주세요.\n 입력예) Mickey Swift")
+        
+        let userInput = readLine()
+        
+        // ==================== input check(S) ====================
+        // 곧바로 엔터친 경우
+        if userInput == "" {
+            print("입력이 잘못되었습니다. 다시 확인해 주세요")
+            break
+        }
+        // 알파벳, 숫자, + 기호, " " 외 문자를 입력한 경우
+        for i in userInput! {
+            if permittedString.contains(String(i)) == false {
+                print("알파벳 대문자, 소문자, 숫자, + 기호만 입력이 가능합니다.")
+                finishFlag = 1
+                break
+            }
+        }
+        
+        if finishFlag == 1 { break }
+        
+        // userInput에 스페이스 한 번이 있는가?
+        if userInput!.filter({ $0 == " "}).count != 1 {
+            print("입력이 잘못되었습니다. 다시 확인해 주세요")
+            break
+        }
+        // ==================== input check(E) ====================
+        
+        // 2 개로 분리하기
+        let firstSpaceIndex = userInput!.firstIndex(of: " ")!
+        let behindOfFirstSpaceIndex = userInput!.index(firstSpaceIndex, offsetBy: 1)
+
+        let name = String(userInput![..<firstSpaceIndex])
+        let subject = String(userInput![behindOfFirstSpaceIndex...])
+        
+        // context 에서 데이터 가져오기
+        let fetchedGradeCards: [GradeCard] = dataManager.readGradeCards()
+        var GradeCards: [GradeCard] = []
+        
+        for fetchedGradeCard in fetchedGradeCards {
+            if fetchedGradeCard.name == name {
+                GradeCards.append(fetchedGradeCard)
+            }
+        }
+        
+        // userInput 으로 받은 학생이 context 에 있는/없는 경우
+        if GradeCards.isEmpty {
+            print("\(name) 학생을 찾지 못했습니다.")
+            break
+        } else {
+
+        }
+        
+        for GradeCard in GradeCards {
+            if GradeCard.subject == subject {
+                dataManager.deleteGradeCard(data: GradeCard)
+                print("\(name) 학생의 \(subject) 과목의 성적이 삭제되었습니다.")
+                finishFlag = 1
+                break
+            }
+        }
+        
+        // 지우려는 과목이 없다
+        if finishFlag != 1 {
+            print("\(name) 학생의 \(subject) 과목의 성적이 없습니다.")
+        }
+        
+    case "5":
+        print("평점을 알고싶은 학생의 이름을 입력해주세요")
+        
+        let userInput = readLine()
+        
+        // ==================== input check(S) ====================
+        // 곧바로 엔터친 경우
+        if userInput == "" {
+            print("입력이 잘못되었습니다. 다시 확인해 주세요")
+            break
+        }
+        
+        // 스페이스가 포함된 경우
+        if let userInput = userInput {
+            if userInput.contains(" ") {
+                print("입력이 잘못되었습니다. 다시 확인해 주세요")
+                break
+            }
+        }
+        // 알파벳, 숫자, + 기호 외 문자를 입력한 경우
+        for i in userInput! {
+            if permittedString.contains(String(i)) == false {
+                print("알파벳 대문자, 소문자, 숫자, + 기호만 입력이 가능합니다.")
+                finishFlag = 1
+                break
+            }
+        }
+        
+        if finishFlag == 1 { break }
+        // ==================== input check(E) ====================
+        
+        
+        // context 에서 데이터 가져오기
+        let fetchedGradeCards: [GradeCard] = dataManager.readGradeCards()
+        var studentGradeCards: [GradeCard] = []
+        
+        for fetchedGradeCard in fetchedGradeCards {
+            if fetchedGradeCard.name == userInput {
+                studentGradeCards.append(fetchedGradeCard)
+            }
+        }
+        
+        // userInput 으로 받은 학생이 context 에 있는/없는 경우
+        if studentGradeCards.isEmpty {
+            print("\(userInput!) 학생을 찾지 못했습니다.")
+            break
+        } else {
+            var gradeSum = 0.0
+            var subjectCount = 0.0
+            var gpa = 0.0
+            
+            for studentGradeCard in studentGradeCards {
+                switch studentGradeCard.grade! {
+                case "A+":
+                    gradeSum += 4.5
+                    subjectCount += 1
+                    print("\(studentGradeCard.subject!): \(studentGradeCard.grade!)")
+                case "A0":
+                    gradeSum += 4.0
+                    subjectCount += 1
+                    print("\(studentGradeCard.subject!): \(studentGradeCard.grade!)")
+                case "B+":
+                    gradeSum += 3.5
+                    subjectCount += 1
+                    print("\(studentGradeCard.subject!): \(studentGradeCard.grade!)")
+                case "B0":
+                    gradeSum += 3.0
+                    subjectCount += 1
+                    print("\(studentGradeCard.subject!): \(studentGradeCard.grade!)")
+                case "C+":
+                    gradeSum += 2.5
+                    subjectCount += 1
+                    print("\(studentGradeCard.subject!): \(studentGradeCard.grade!)")
+                case "C0":
+                    gradeSum += 2.0
+                    subjectCount += 1
+                    print("\(studentGradeCard.subject!): \(studentGradeCard.grade!)")
+                case "D+":
+                    gradeSum += 1.5
+                    subjectCount += 1
+                    print("\(studentGradeCard.subject!): \(studentGradeCard.grade!)")
+                case "D0":
+                    gradeSum += 1.0
+                    subjectCount += 1
+                    print("\(studentGradeCard.subject!): \(studentGradeCard.grade!)")
+                case "F":
+                    gradeSum += 0.0
+                    subjectCount += 1
+                    print("\(studentGradeCard.subject!): \(studentGradeCard.grade!)")
+                default:
+                    break
+                }
+            }
+            gpa = gradeSum / subjectCount
+            
+            if subjectCount == 0 {
+                print("평점: 0.0")
+            } else {
+                print("평점: \(String(format: "%.2f", gpa))")
+            }
+        }
+        
+    default:
+        print("뭔가 입력이 잘못되었습니다. 1~5 사이의 숫자 혹은 X를 입력해 주세요")
+        break
+    }
+}